package com.tedu;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;

public class Demo01 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("请输入用户名: ");
        String username = scan.nextLine();
        System.out.println("请输入密码: ");
        String password = scan.nextLine();
        System.out.println("请输入昵称");
        String nick = scan.nextLine();

        try (Connection conn = DBUtils.getConn();) {
            String sql = "select id from user where username=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,username);
            ResultSet rs = ps.executeQuery();
            if(rs.next()){
                System.out.println("用户已存在!");
            }else{
                String s = "insert into user values(null,?,?,?)";
                ps = conn.prepareStatement(s);
                ps.setString(1,username);
                ps.setString(2,password);
                ps.setString(3,nick);
                ps.executeUpdate();
                System.out.println("恭喜您,注册成功!");
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}
